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/*
 * Copyright 2022 The OSHI Project Contributors
 * SPDX-License-Identifier: MIT
 */
package oshi.driver.windows.perfmon;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.sun.jna.platform.win32.Advapi32Util;
import com.sun.jna.platform.win32.WinReg;

import oshi.annotation.concurrent.ThreadSafe;
import oshi.util.GlobalConfig;
import oshi.util.Util;

/**
 * Tests whether performance counters are disabled
 */
@ThreadSafe
public final class PerfmonDisabled {

    private static final Logger LOG = LoggerFactory.getLogger(PerfmonDisabled.class);

    static final boolean PERF_OS_DISABLED = isDisabled(GlobalConfig.OSHI_OS_WINDOWS_PERFOS_DIABLED, "PerfOS");
    static final boolean PERF_PROC_DISABLED = isDisabled(GlobalConfig.OSHI_OS_WINDOWS_PERFPROC_DIABLED, "PerfProc");
    static final boolean PERF_DISK_DISABLED = isDisabled(GlobalConfig.OSHI_OS_WINDOWS_PERFDISK_DIABLED, "PerfDisk");

    /**
     * Everything in this class is static, never instantiate it
     */
    private PerfmonDisabled() {
        throw new AssertionError();
    }

    private static boolean isDisabled(String config, String service) {
        String perfDisabled = GlobalConfig.get(config);
        // If null or empty, check registry
        if (Util.isBlank(perfDisabled)) {
            String key = String.format("SYSTEM\\CurrentControlSet\\Services\\%s\\Performance", service);
            String value = "Disable Performance Counters";
            // If disabled in registry, log warning and return
            if (Advapi32Util.registryValueExists(WinReg.HKEY_LOCAL_MACHINE, key, value)) {
                Object disabled = Advapi32Util.registryGetValue(WinReg.HKEY_LOCAL_MACHINE, key, value);
                if (disabled instanceof Integer) {
                    if ((Integer) disabled > 0) {
                        LOG.warn("{} counters are disabled and won't return data: {}\\\\{}\\\\{} > 0.", service,
                                "HKEY_LOCAL_MACHINE", key, value);
                        return true;
                    }
                } else {
                    LOG.warn(
                            "Invalid registry value type detected for {} counters. Should be REG_DWORD. Ignoring: {}\\\\{}\\\\{}.",
                            service, "HKEY_LOCAL_MACHINE", key, value);
                }
            }
            return false;
        }
        // If not null or empty, parse as boolean
        return Boolean.parseBoolean(perfDisabled);
    }
}